Question

How to find the next sparse number which greater than or equal to a given number in Rust

Answer 1

/*
If there are no two consecutive 1s in a number binary representation, 
it is Sparse. 5 (101) is sparse, 6 (110) is not. 
*/

fn main() {
  println!("{}", next_sparse(6));
  println!("{}", next_sparse(5));
  println!("{}", next_sparse(38));
  println!("{}", next_sparse(305));
}

fn is_sparse(n: i32) -> bool {
    let result = n & (n >> 1);
      
    if result == 0 {
      return true;
    }
      
    return false;
}

fn next_sparse(number: i32) -> i32 {
    let mut n: i32 = number;
    loop  {
        if is_sparse(n) == true {
            return n;
        }
        n += 1;
    }
}






/*
run:
  
8
5
40
320
  
*/

 

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